Mildew, germination

Inorganics. Sulfur was the first effective fungicide and is still widely used as a protectant acting through the inhibition of conidial germination. The selective activity of sulfur against powdery mildews... 

Triadimefon at 250 ppm ai was sprayed on young mildew pustules. After 24, 48 and 72 hours, spores from treated pustules were harvested and tested for their capacity to germinate and cause infection (7). It was found, that the number of germinating spores which caused infection decreased with increasing time (Table I). The change in appearance of the mildew pustules after treatment is shown in Figures 6 and 7 (7). 

Diflumetorim (Piricat , Pyricut ) [119] is a non-systemic fungicide for use in cereals and ornamentals. Diflumetorim inhibits the germination of powdery mildew and rust. 

Quinoxyfen is a fungicide that is used for the control of powdery mildew diseases by interfering with germination, and, in some cases, such as barley powdery mildew, appressorium formation [170],... 

Wippich, C. and Wink, M. 1985. Biological properties of alkaloids. Influence of quinolizidine alkaloids and gramine on the germination and development of powdery mildew, Erysiphe graminis f. sp. hordei. Experientia 41,1477-1478... 

At temperatures of 4-10°C the germination of the mildew spores is very slow. 

Mildew, scab, rust mites, pear pox mites Preventive against fungi, kills the germinating spores... 

Copper salts Inorganic Prevents spore germination nonsystemic Control of powdery mildew, blights, and rust —... 

Lime-sulfur prevents spore growth and can also kill recently germinated spores. Lime-sulfur is useful against such diseases as apple scab, brown rot on peaches, and powderx mildews. This compound is more toxic to plants than plain sulfur, so use it with caution. Lime-sulfur is often used as a dormant spray, w hen there is less chance of damaging the plant. 

Protection Offered Reports indicate that antitranspirants form a barrier on leaves to prevent disease organisms such as powdery mildew spores from germinating and infecting plants. However, these products are not approved and registered for use as fungicides. 

Figure 16.1 Effect of Acacia arabica gum treatment on germination and seedling vigor of pearl millet under laboratory conditions (a) Effect of Acacia arabica gum treatment on control of downy mildew disease of pearl millet caused by Sclerospora graminicola under green house conditions (b) and field conditions (c).

C4H,N02, Mr 129.16, mp. 240°C (decomp.), [a]o -12.4° (H2O). A non-proteinogenic amino acid in the fruit bodies of Amanita viigineoidesIt inhibits the growth of Escherichia coli as well as spore germination of Pyricularia oryzae (mold as cause of mildew on rice). 

Laboratory studies also indicated that LY186054 prevents spore germination. A fifteen-minute exposure of wheat powdery mildew conidia to 1-10 ppm solutions of this compound followed by inoculation showed no disease incidence in whole wheat plants. 

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